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Re: Public / Publics???

'publics' is a term used in Public Relations. e.g.

Publics targeting
A fundamental technique used in public relations is to identify the target audience, and to tailor every message to appeal to that audience. It can be a general, nationwide or worldwide audience, but it is more often a segment of a population. Marketers often refer to economy-driven "demographics," such as "black males 18-49," but in public relations an audience is more fluid, being whoever someone wants to reach. For example, recent political audiences include "soccer moms" and "NASCAR dads." There is also a psychographic grouping based on fitness level, eating preferences, "adrenaline junkies,"etc...
In addition to audiences, there are usually stakeholders, literally people who have a "stake" in a given issue. All audiences are stakeholders (or presumptive stakeholders), but not all stakeholders are audiences. For example, a charity commissions a PR agency to create an advertising campaign to raise money to find a cure for a disease. The charity and the people with the disease are stakeholders, but the audience is anyone who is likely to donate money.
Sometimes the interests of differing audiences and stakeholders common to a PR effort necessitate the creation of several distinct but still complementary messages. This is not always easy to do, and sometimes – especially in politics – a spokesperson or client says something to one audience that angers another audience or group of stakeholders.

'publics' refers to the different 'audiences', the various segments of the population that a message is tailored toward.
See also the thumbnail, from another source. Note the second and third sub-heading.